Ultrafast modification of coherent phonons during the photoinduced insulator-to-metal phase transition in neodymium nickelate
Oleg Dogadov, Grace A. Pan, Andrea Villa, Dan Ferenc Segedin, Premysl Marsik, Charles M. Brooks, Hanjong Paik, Qi Song, Valeria Russo, Carlo S. Casari, Julia A. Mundy, Giulio Cerullo, Stefano Dal Conte
DOI 10.1103/yg97-vfmn · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The interplay between electronic and lattice degrees of freedom in the insulator-to-metal transition (IMT) in rare-earth nickelates is a long-standing question. In the present work, broadband ultrafast transient reflectivity (TR) spectroscopy is applied to study the photoinduced IMT in NdNiO3. Both coherent and incoherent terms of the TR signal show discontinuous behavior around the same pump fluence value. A drastic drop in the sample reflectivity appearing at ∼100 fs timescale in the high excitation density regime indicates the closing of the gap across the IMT. In this regime, coherent phonons associated with the low-temperature crystal phase are not observed even at early time delays, indicating an ultrafast transformation of the lattice potential. A detailed analysis of the coherent phonons indicates a strong coupling between some phonon modes, electronic excitations, and possibly the magnetic order. In this study, we provide insights into the ultrafast dynamics of rare-earth nickelates.
Similar papers
Raman scattering investigation across the magnetic and metal-insulator transition in rare earth nickelate RNiO3 (R=Sm, Nd) thin films
similarity 0.89C. Girardot et al.
Source status unknown — claims are unverified
Conductivity noise across temperature-driven transitions of rare-earth nickelate heterostructures
similarity 0.87Gopi Nath Daptary et al.
Source status unknown — claims are unverified
Interface density driven metal-to-insulator transition in nickelate based heterostructures
similarity 0.87Lucia Varbaro et al.
Source status unknown — claims are unverified
Photo-induced semimetallic states realised in electron-hole coupled insulators
similarity 0.86Kozo Okazaki et al. · 2018 · arXiv:1809.03166
Source status unknown — claims are unverified
Preempted phonon-mediated superconductivity in the infinite-layer nickelates
similarity 0.85Q. N. Meier et al.
Source status unknown — claims are unverified
Revealing the similarity to Ruddlesden-Popper nickelates and electron-phonon coupling in the infinite-layer nickelate superconductor (Sm0.69Ca0.05Eu0.26)NiO2 by pump-probe spectra
similarity 0.85Qiong Wu et al.
Source status unknown — claims are unverified